Is Qadi Iyad's Kitab Ash Shifa reliable?

Assalamoalikum, I wanted to learn if Qadi Iyad's Kitab Ash Shifa is a reliable source among Sunni scholars or not. I am asking this in the sense of the author's reliability and writings. Of course, some Sahih and Da'if Hadith references are found inside the book. Still, this question has a lesser focus on the Hadith references but rather on the reliability of the content in the book written by Qadi Iyad himself.